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S301 |
Stochastic Cooling System for the Collector Ring at FAIR |
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- C. Dimopoulou, A. Bardonner, R.M. Böhm, O.E. Gorda, R. Hettrich, C. Peschke, S. Wunderlich, C. Zhang
GSI, Darmstadt, Germany
- B. Breitkreutz, N. Shurkhno, R. Stassen
FZJ, Jülich, Germany
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An overview on the demanding stochastic cooling system of the Collector Ring at FAIR is given. The system operates in the frequency band 1-2 GHz, it has to provide fast 3D cooling of antiproton, rare isotope and stable heavy ion beams. The main challenges are (i) the cooling of antiprotons by means of cryogenic movable pick-up electrodes and (ii) the fast two-stage cooling (pre-cooling by the Palmer method, followed by the notch filter method) of the hot rare isotope beams. Progress in designing, manufacturing, testing and integrating the hardware is discussed. The performance of the stochastic cooling processes is predicted by dedicated simulations (rate equations for transverse cooling, Fokker Planck approach for longitudinal cooling).
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Slides S301 [12.697 MB]
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P1003 |
Recommissioning of the CRYRING@ESR Electron Cooler |
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- C. Krantz, Z. Andelkovic, C. Dimopoulou, W. Geithner, T. Hackler, F. Herfurth, R. Hess, M. Lestinsky, E. Menz, A. Reiter, J. Roßbach, C. Schroeder, A. Täschner, G. Vorobjev
GSI, Darmstadt, Germany
- C. Brandau, S. Schippers
Justus-Liebig-University Giessen, I. Physics Institute, Atomic and Molecular Physics, Giessen, Germany
- V. Hannen, D. Winzen
Westfälische Wilhelms-Universität Münster, Institut für Kernphysik, Münster, Germany
- C. Weinheimer
Institut für Kernphysik, Westfälische Wilhelms-Universität Münster, Münster, Germany
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Funding: Parts of this work have been supported by the German Federal Ministry of Education and Research (BMBF) under contract numbers 05P19PMFA1 and 05P19RGFA1.
The cooler storage ring CRYRING has been recommissioned at GSI as a Swedish in-kind contribution to FAIR. Within the CRYRING@ESR project, it complements the heavy-ion facilities of GSI by a dedicated low-energy machine. Large parts of the CRYRING@ESR experimental programme rely on electron cooling as a means of beam preparation. Additionally, the cooler serves itself as low-energy internal electron target in atomic physics experiments. Upon installation of the cooler at GSI/FAIR, a number of technical upgrades have been made to improve operational performance and flexibility as an experimental platform. These include custom-made precision voltage dividers for monitoring the acceleration potential on the < 10 ppm level, as well as an experiment control system allowing rapid modulation of the electron energy. In recent GSI beamtimes, the electron cooler has been used successfully for cooling of highly-charged and singly-charged heavy-ion beams. Further hardware upgrades and dedicated experiments to characterise machine performance are planned.
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Poster P1003 [2.078 MB]
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| P2003 |
Control Features of the Plunging Pick-Up Electrodes With Real Time Digital Data Processing |
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- R. Hettrich, R.M. Böhm, C. Dimopoulou, C. Peschke
GSI, Darmstadt, Germany
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The Pick-Up electrodes of the CR Stochastic cooling system can be positioned very precisely and fast. In the normal operating state, a function without jerk provides the set values for an underlying position control loop. Moving the electrodes however with the drives within a narrow tank can be very challenging. For installation and service, we need a manual control facility, which allows to steer the mobile drive rods slowly to the electrodes. Hence eight hand wheels, one at each drive, will make manual positioning of each. A bus-shaped network from several wheel-controllers to a central computer was implemented. A smooth and data saving transmission can be achieved by applying approved techniques from real time data processing. The equipment of analogue drive systems with digital regulation and controls allows to change the proportion between drive distance and angle of rotation of a hand wheel only by means of software.
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Poster P2003 [1.835 MB]
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-COOL2021-P2003
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| About • |
paper received ※ 22 October 2021 paper accepted ※ 22 November 2021 issue date ※ 10 November 2021 |
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